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Old 01-04-2010, 12:42 PM   #1
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


I'm going to run two new circuits into my attic. I'm in the process of insulating it right now, using 2" Foamular 250 rigid foam insulation. When I'm done there will be a small triangular attic left that is unheated. It seems that the conditions in the attic are similar in temperature and humidity to outdoors, so I thought it might be wise to use outdoor cable for wiring the attic since it will be running through the unheated space. Would that be necessary? Also, since foam insulation isn't fire resistant, would it make sense to use fiberglass just on the horizontal ceiling spaces over which the wiring will run?

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Old 01-04-2010, 01:45 PM   #2
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


Not Required by the NEC.

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Old 01-04-2010, 02:53 PM   #3
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


Thanks for the help!

Is there any merit to the idea, or is it not worth the extra cost?

Thanks again!
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Old 01-04-2010, 02:57 PM   #4
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


Thousands upon thousands are wired in NM with no problem.

Are you putting the insulation on the underside of the roof decking or on top of the ceiling?
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Old 01-04-2010, 03:00 PM   #5
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


On top of the ceiling.
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Old 01-04-2010, 03:10 PM   #6
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Is it better to use outdoor non-metallic sheathed electrical cable in an attic?


Quote:
Originally Posted by MNHomesteader View Post
On top of the ceiling.
The only concern I would have is a possible reaction from the curing process of the insulation aganist the NM outer sheath. Ive seen alot of this type of installations dont know of any problems to this date.

It could make a differance if the insulation is water base or a petroleum base.

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